Kelly Crowe is a medical sciences correspondent for CBC News, specializing in health and biomedical research. She joined CBC in 1991, and has spent 25 years reporting on a wide range of national news and current affairs, with a particular interest in science and medicine.

There's a disturbing truth that is emerging from the science of obesity. After years of study, it's becoming apparent that it's nearly impossible to permanently lose weight.

As incredible as it sounds, that's what the evidence is showing. For psychologist Traci Mann, who has spent 20 years running an eating lab at the University of Minnesota, the evidence is clear. "It couldn't be easier to see," she says. "Long-term weight loss happens to only the smallest minority of people."

We all think we know someone in that rare group. They become the legends — the friend of a friend, the brother-in-law, the neighbour — the ones who really did it.

But if we check back after five or 10 years, there's a good chance they will have put the weight back on. Only about five per cent of people who try to lose weight ultimately succeed, according to the research. Those people are the outliers, but we cling to their stories as proof that losing weight is possible.

"Those kinds of stories really keep the myth alive," says University of Alberta professor Tim Caulfield, who researches and writes about health misconceptions. "You have this confirmation bias going on where people point to these very specific examples as if it's proof. But in fact those are really exceptions."

Our biology taunts us, by making short-term weight loss fairly easy. But the weight creeps back, usually after about a year, and it keeps coming back until the original weight is regained or worse.

Musicians

Quotes

"The subjects of every state ought to contribute towards the support of the government, as nearly as possible, in proportion to their respective abilities." — Adam Smith (1723-1790)

"I hope we shall crush in its birth the aristocracy of our moneyed corporations which dare already to challenge our government in a trial of strength, and bid defiance to the laws of our country." — Thomas Jefferson

"A government, for protecting business only, is but a carcass, and soon falls by its own corruption and decay." — Amos Bronson Alcott (1799-1888)

"... to waste, to destroy, our natural resources, to skin and exhaust the land instead of using it so as to increase its usefulness, will result in undermining in the days of our children the very prosperity which we ought by right to hand down to them amplified and developed." — Theodore Rosevelt

"Anyone who believes exponential growth can go on forever in a finite
world is either a madman or an economist." — Kenneth Boulding
(1910-1993)

Tom Maertens served as National Security Council director for nonproliferation and homeland defense under Presidents Bill Clinton and
George W. Bush, and as deputy coordinator for counterterrorism in the State Department during and after 9/11. Before retiring from the U.S. Foreign Service in 2002, he had served in Ethiopia, Colombia, the USSR, Panama, Austria, and Russia after the breakup of the Soviet Union.

Leigh Pomeroy has written on subjects ranging from politics to health care to film to wine. He has assisted on two books, Dr. D's Handbook for Men Over 40 by Dr. Peter Dorsen and Not What the Doctor Ordered by Jeffrey C. Bauer. In 2004, he was the DFL (Democratic Party) Candidate for the U.S. House of Representatives in Minnesota's 1st Congressional District. He formerly taught writing and film at Minnesota State University, Mankato.